As it is known, Hempcrete has a porous structure, which means it has an
ability to store and hold water. According to some researches, Hempcrete
can manage moisture related issues and problems effectively, but due to
the ability of hemp to absorb high capacities of water and porosity of the
whole structure, Hempcrete becomes a very sensitive material to the
capillary actions. Following the tests and research made by Yoann Castel
(0000) this ability of Hempcrete can deteriorate and change the
characteristics of the material. High water content in the material can lead
to the bulking of the aggregate with subsequent alterations of volume and
decrease of compressive resistance of Hempcrete, due to the changes of
the binder matrix. Firstly, in order to protect the material from extreme
humidity and to avoid such quality degradation, it is extremely important
to watch over conditions, in which and where Hempcrete is cast and
constructed. Secondly, a hydrophobic product can be added during the
manufacturing of Hempcrete, to limit the absorption of water by hemp
(Yoann, Sofiane, Mohammed, 0000).